In 2003, there were a few popular social media platforms that people were utilizing. These included MySpace, Friendster, Xanga, and LiveJournal.
MySpace was a very popular platform at the time, with a focus on music and strong social connections. It had many features that enabled users to customize their profiles, from adding music and photos to sharing their thoughts and ideas.
Friendster also had a large user base in 2003. It was a "Friend Finder" platform which enabled users to explore the social graph of their extended social circles and make new connections online.
Xanga was another popular platform in 2003, especially for blogging and micro-blogging. It let users create blog posts and share their thoughts with their circles of friends.
Finally, LiveJournal was a platform well known for giving users the ability to create their own personal social networks, allowing them to share more personal stories and experiences with a small group of trusted contacts.
Overall, these four social media platforms were some of the most influential ones at the time and still remain popular today.